Previously, we have seen the method of designing a 0-9 counter. Here, we will cascade two BCD/Decade counter modules to design a 00-99 counter. Circuit is done as given in following diagram. RESET button, COUNT button, R1 ans C1 need not be connected in second BCD/Decade counter module. Because, in cascaded operation, count can be incremented by pressing the COUNT button on first BCD/Decade counter module. Similarly, RESET button will reset the count in both seven segment displays. R(0)2 connection between two BCD/Decade counter modules will help to reset all the BCD/Decade counters to 0 from a single RESET button.